Griffiths QM Problem 4.13 (3rd ed.) Finding Expectation Values for Hydrogen Atom

In this video I will solve problem 4.13 as it appears in the 3rd edition of Griffiths introduction to quantum mechanics. The problem states:
a) Find expectation value of r and r^2 for an electron in the ground state of Hydrogen. Express your answers in terms of the Bohr radius a.
b) find the expectation values of x and x^2 for an electron in the ground state of hydrogen.
c) Find the epxectation value of x^2 in the state n=2, l=1, m=1.
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My name is Nick Heumann, I am a recently graduated physicist. I love to teach physics, so I decided to give YouTube a try. English is not my first language, but I hope that you can understand me well enough regardless.
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
00:00 Introducing the Problem
00:44 a) Finding a general formula for expectation values of r
07:20 a) Using that formula to find expectation value of r and r squared
09:10 b) Finding expectation value of xfor n=1, l=0, m=0
11:45 b) Finding expectation value of x^2 for n=1, l=0, m=0
13:00 c) Finding expectation value of x^2 for n=2, l=1, m=1
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